Fair Value Measurements (Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs) (Level 3) (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance		$ 831		$ 438		$ 804		$ 380
Included in earnings		(29)		13		(42)		103
Purchases/originations		120				174		(1)
Settlements		(24)		(43)		(41)		(76)
Transfers Into Level 3	[1]	4		4		7		6
Ending Balance		902		412		902		412
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held	[2]	(41)		3		(76)		53
Residential Mortgage
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance		141		160		143		167
Included in earnings		1		1		1		3
Purchases/originations		0				0		0
Settlements		(4)		(11)		(9)		(22)
Transfers Into Level 3	[1]	4		4		7		6
Ending Balance		142		154		142		154
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held	[2]	1		1		1		3
Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance		776				744
Included in earnings		(47)				(70)
Purchases/originations		120				(175)
Settlements		0				0
Transfers Into Level 3		0	[1]			0
Ending Balance		849				849
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held		(47)	[2]			70
Interest Rate Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance		11	[3]	25	[4],[5]	8	[3]	12	[4],[5]
Included in earnings		26	[3]	43	[4],[5]	49	[3]	84	[4]
Purchases/originations		0	[3]			(1)	[3]	(1)	[4]
Settlements		(28)	[3]	(38)	[4],[5]	(47)	[3]	(65)	[4]
Transfers Into Level 3	[1]	0	[3]	0	[4],[5]	0	[3]	0	[4]
Ending Balance		9	[3]	30	[4],[5]	9	[3]	30	[4],[5]
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held	[2]	14	[3]	33	[4],[5]	15	[3]	34	[4]
Equity Contract
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance		(97)	[3]	253	[4],[5]	(91)	[3]	201	[4],[5]
Included in earnings		(9)	[3]	(31)	[4],[5]	(22)	[3]	16	[4]
Purchases/originations		0	[3]			0	[3]	0	[4]
Settlements		8	[3]	6	[4],[5]	15	[3]	11	[4]
Transfers Into Level 3	[1]	0	[3]	0	[4],[5]	0	[3]	0	[4]
Ending Balance		(98)	[3]	228	[4],[5]	(98)	[3]	228	[4],[5]
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held	[2]	$ (9)	[3]	$ (31)	[4],[5]	$ (22)	[3]	$ 16	[4]

[1] Includes certain residential mortgage loans originated as held for sale that were transferred to held for invest ment.

[2] Includes interest income and expense . Effective January 1, 2017, the Bancorp has elected the fair value measurement method for all existing classes of its residential mortgage servicing rights. The servicing r ights were measured at fair value at June 30 , 2017 and were measured under the amortization method at December 31, 2016 .

[3] Net interest rate derivatives include derivative assets and liabilities of $ 14 and $ 5 , respectively , as of June 30, 2017 .

[4] Net interest rate derivatives include derivative assets and liabilities of $34 and $4 , respectively, as of June 30, 2016 . Net equity derivatives include derivativ e assets and liabilities of $327 and $99 , respectively, as of June 30, 2016 .

[5] Net interest rate derivatives include derivative assets and liabilities of $ 34 and $ 4 , respectively, as of June 30, 2016 . Net equity derivatives include derivative assets and liabilities of $ 327 and $ 99 , respectively, as of June 30, 2016 .